Rod diameter gauge



FIG. 1 is a perspective view of my rod diameter gauge, viewed from above;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a front end elevational view thereof; and,

FIG. 6 is a rear end view thereof.

A side elevational view of the left side of my rod diameter gauge is a mirror image of FIG. 4. 

The ornamental design for a rod diameter gauge, as shown and described. 